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 A154087 Number of planar triangular n X n X n nonnegative integer grids symmetric both under 120 degree rotation and reflection with every similarly oriented 5 X 5 X 5 subtriangle summing to 12. 0
 22, 40, 80, 53, 27, 67, 30, 17, 28, 9, 10, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6, 9, 9, 9, 9, 6 (list; graph; refs; listen; history; text; internal format)
 OFFSET 5,1 COMMENTS Pattern 6 9 9 9 9 starts at n=16 and continues through at least n=51. LINKS EXAMPLE Maximal zeros solution for n=16 .................6 ................0.0 ...............0.0.0 ..............0.2.2.0 .............0.0.2.0.0 ............4.1.0.0.1.4 ...........0.1.0.2.0.1.0 ..........0.0.0.2.2.0.0.0 .........0.2.2.0.0.0.2.2.0 ........0.0.2.0.1.1.0.2.0.0 .......4.1.0.0.1.2.1.0.0.1.4 ......0.1.0.2.0.1.1.0.2.0.1.0 .....0.0.0.2.2.0.0.0.2.2.0.0.0 ....0.2.2.0.0.0.2.2.0.0.0.2.2.0 ...0.0.2.0.1.1.0.2.0.1.1.0.2.0.0 ..6.0.0.0.0.4.0.0.0.0.4.0.0.0.0.6 CROSSREFS Sequence in context: A188156 A026061 A138040 * A063327 A066957 A118602 Adjacent sequences:  A154084 A154085 A154086 * A154088 A154089 A154090 KEYWORD nonn AUTHOR R. H. Hardin Jan 04 2009 STATUS approved

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Last modified September 23 20:42 EDT 2021. Contains 347617 sequences. (Running on oeis4.)